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Appendix SI. Ultrasound images of pregnant and non-pregnant females and visual assessment of female reproductive state.

Fig. S1. Examples of each dorsal abdominal distension rank used to visually assess female reproductive state at the time of tagging. Rank scores (−1 to 3) are shown from left to right. Dorsal abdominal distension ranks were assigned using the following criteria: −1, female is emaciated, skeletal features (e.g. vertebral column and pelvic girdle) are visible; 0, no distension, abdomen morphology similar to that of males or females during the non-breeding season; 1, slight-to-moderate amount of distension; 2, large amount of distension, but abdomen not yet fully distended; 3, abdomen fully distended, with high tension on the skin.

JFB_3208_sm_as1_fs1.pdf802KSupporting info item

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